1064 



Manures for February. 



[Feb., 



NOTES ON MANURES FOR 

 FEBRUARY. 



E. J. Kussell, D.Sc, F.B.S., 



Rothamsted Experimental Station, Harpcnden, Herts. 



The Return from Spring Dressings of Nitrogenous Ferti- 

 lisers. — In these notes emphasis has repeatedly been laid on 

 the necessity for applying spring dressings of nitrogenous ferti- 

 lisers to cereals. A demonstration on the large scale was arranged 

 l ist season on wheat on Great Harpenden Field, Rothamsted, 

 the results of which show the returns obtainable. The wheat 

 had been preceded by a wheat crop, and this by oats; the 

 land, however, had been given a good bastard fallowing during 

 the fine weather of 1919, and weeds had been fairly well cleared 

 away. The results were : — 







Single Di 



'essini 



f of Sulphate of 







Ammonia ( 100 lb. per acre). 





Control. 

























Applied early, 



Applied 



Applied late. 







Feb.l0th,/20. 



March 6th. 



May 10th. ' 



Dressed Grain, bush, per 













acre 



28-9 



28-7 



29-8 



31-6 



Increase on manured 













plots ... 





Nil 



0-9 



27 



Wt. per bush, dressed 

 grain... 













639 



G3-6 



03-8 



62-7 



Proportion of offal grain 













to 190 of dressed grain 



6-4 



6-3 



C 



•9 



13-5 



St -aw, cwt. per acre 



24-2 



26-9 



311 



33-6 



Increase on manured 













plots ... 





2-7 



G-9 



9-4 









Double Dressing of Sulphate of 





Con'rol. 



Ammonia ( 200 lb. per acre). 



























Applied early, 

 Feb. 10th, 1920. 



Applied late, 

 May 10th, 1920. 









Dressed grain, bush, per 













acre ... 



28-9 



35-9 







32 6 



Increase on manured 













plots ... 





7-0 







3-7 



Wt. per bush, dressed 













grain... 



63-9 



G36 







627 



Proportion of offal grain 













to 100 of dressed grain 



6-4 



65 







157 



Straw, cwt. per acre 



24-2 



35-9 







36-9 



Increase on manured 













plots ... 





11-7 







12-7 



